A second passport does not decide Vietnamese tax residence

Vietnam replaced its personal income tax statute on 1 July 2026. Law No. 109/2025/QH15, passed on 10 December 2025, repealed the 2007 law and eight amending statutes, though its provisions on residents’ business, salary and wage income apply from the 2026 tax period. Decree No. 253/2026/NĐ-CP of 30 June 2026 replaced the 2013 decree. For a Vietnamese national holding a foreign residence permit or a second citizenship, one question runs through the rebuilt text: what ends the duty to declare worldwide income in Vietnam.

What the law makes the test

Article 2(2) of the law makes a person a resident individual on meeting either of two conditions. The first is presence in Vietnam for 183 days or more, counted in a calendar year or across 12 consecutive months from the first day of presence. The second is a regular place of residence in Vietnam, which the article defines as a registered permanent residence or a dwelling leased in Vietnam under a fixed-term lease.

Two features of that sentence matter. It is disjunctive, so failing the day count settles nothing while the second limb is still met. And neither limb mentions nationality: a Vietnamese passport does not by itself make a person a tax resident, and a second passport does not by itself stop them being one. Article 2(3) defines the non-resident residually, as anyone who meets neither condition.

The stake is the difference between the two categories. Under Article 2(1) of the law and Article 6(2) of the decree, a resident is taxed on taxable income arising inside and outside Vietnam, exempt income aside, while a non-resident is taxed only on income arising inside it. Article 8(1) adds the term that matters to anyone drawing a salary abroad: a resident’s employment income is taxed regardless of where it is paid.

What counts as an address

Article 2(4) of the law hands the detail to the Government, and Article 4 of the decree supplies it. For a Vietnamese citizen, a registered permanent residence means the place where the person lives regularly and stably with no fixed term at a particular dwelling and has registered permanent residence under the residence legislation.

The leasing limb reaches further than the phrase suggests. Under Article 4(2)(b), an individual without a registered permanent residence is likewise determined to be a resident where leases for a dwelling total 183 days or more in the tax year, including leases at several places. Leased dwellings include hotels, guesthouses, lodging houses, workplaces and office premises, and it makes no difference whether the individual or an employer signed the lease.

Article 4(1) settles the arithmetic. Arrival and departure each count as a day, and both falling on one day count as one day of residence. The dates come from the immigration authority’s endorsement in the passport or laissez-passer, or from documents relating to the purpose of entry and exit.

The rule behind the ordinary departure

The provision that answers the departure case is Article 4(3) of the decree. Where an individual has a regular place of residence in Vietnam but is in fact present for under 183 days in the tax year, and cannot prove that they are a tax resident of any country, that individual is a Vietnamese tax resident.

The provision runs one way. It states the outcome that follows unless the individual proves tax residence elsewhere, and names the instrument that does the proving: a certificate of residence issued by the other jurisdiction. Where that country or territory has a double taxation agreement with Vietnam and issues no such certificate, a copy of the passport may be used instead to evidence the period of residence.

A residence permit is not that certificate, and neither is a naturalisation decree. Both establish a right to be somewhere; the certificate establishes that the other state treats the holder as its tax resident, which is what Article 4(3) puts in issue.

The year that straddles the move

Article 4(3) measures presence across the tax year. Article 66 of the decree sets the tax periods themselves, and they differ by type of income. For a resident, business and employment income run on the calendar year. Where a person is present for under 183 days in a calendar year but reaches 183 days across 12 consecutive months from the first day of presence in Vietnam, the first tax period is those 12 months; the calendar year takes over from the second year, and the decree gives a formula deducting the overlapping months’ tax from the second year’s liability.

For a resident, investment income, capital and securities transfers, real-estate transfers, winnings, royalties, franchising and inherited or gifted property are taxed per occurrence rather than annually, under Article 66(1)(b). Each such receipt is assessed on its own occurrence rather than gathered into the year.

Declaration can fall on the individual directly. Article 67(5) requires a person paid by a foreign organisation not registered for tax in Vietnam to declare and pay the tax themselves. Where a double taxation agreement is in place, Article 6(3) credits personal income tax paid abroad against the Vietnamese liability in accordance with that agreement. Finalisation follows the law on tax administration, under Article 68; an individual finalising directly files no later than the last day of the fourth month after the calendar year ends, under Article 44(2)(b) of Law 38/2019/QH14.

What the rebuild did not settle

Article 68 sets out no separate procedure for a resident who leaves partway through a year, referring the subject to the tax administration legislation. The decree names the certificate of residence as the proof without saying which year’s certificate answers a Vietnamese tax year that only partly overlaps the foreign one. Article 71(1) leaves the Minister of Finance to detail what the decree delegates; Circular 87/2026/TT-BTC, which replaced the 2013 circular outright, exercises that power on dependant deductions and derivative securities, and says nothing about residence.

What the instruments leave is a narrow test. The date on a foreign residence permit appears nowhere in it. Presence and address are alternative conditions, and where the address condition is met while presence falls short of 183 days, Article 4(3) turns the question into one of documentary proof: a certificate of residence from the other jurisdiction, or, where that jurisdiction issues none and has a double taxation agreement with Vietnam, a copy of the passport.